afaik... Theres 2 ways which an ISP can submit to BT for a speed regrade with max.
1) This way seems to get done overnight, this is if the ISP submits it manually using the
modify order through ECO.
2) Then theres the automated proceedure, where the ISP submits the automated max
regrades to BT via an xml list.
This seems to take BT a full 5 working days.
Theres restrictions on the number of both that the ISP can submit to BT.
1) Because of the time it takes the ISP to manually input the details (man hours).
2) BT limit the amount of auto upgrades that the ISP can process per day.
Most max regrades are done using method 2.
Theres a way that you may be able to check to see if a regrade has been processed for your line.
How to check your adsl order status.